Vortex wave mode switching method and apparatus, electronic device, and storage medium

Abstract

The application provides a vortex wave mode switching method and device, electronic equipment and a storage medium. Based on microwave photon phase encoding technology, a to-be-fed radio frequency signal, an encoded signal with a phase that changes continuously in a step shape over time, and an optical signal are modulated to obtain a modulated signal with a phase that changes continuously in a step shape over time. Then, according to a light-controlled beam forming network based on a delay method in radar technology, the modulated signal is branched and introduced into different time delays, so that the to-be-fed radio frequency signal meets the phase condition for vortex wave generation, and a vortex wave is obtained. Subsequently, the vortex wave mode is controlled and mode switching is performed by controlling the encoded signal. The method has strong controllability and high flexibility. The same mode duration and different mode switching speeds can be flexibly controlled by controlling the encoded signal, and multi-mode fast switching can be performed, which is helpful to improve the radar scanning rate and imaging resolution.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to vortex wave mode switching methods, apparatus, electronic devices and storage media. Background Technology

[0002] In related technologies, vortex wave mode switching is achieved by using an electrical phase shifter to process the phase of the signal to be fed or by using an optical switch to switch the signal group to be fed. However, using an electrical phase shifter to process the phase of the signal to be fed is relatively complex and makes it difficult to achieve multi-mode switching of vortex waves. The switching speed of mode switching via an optical switch is limited by the response speed of the optical switch, neither of which can meet the requirements for fast multi-mode switching of vortex waves. Summary of the Invention

[0003] In view of this, the purpose of this application is to provide a vortex wave mode switching method, apparatus, electronic device and storage medium.

[0004] To achieve the above objectives, this application provides a vortex wave mode switching method for a circular antenna array, the circular antenna array comprising a plurality of antennas arranged in sequence, the method comprising:

[0005] The method acquires a radio frequency signal to be fed, an encoded signal for modulating the phase of the radio frequency signal to be fed, and an optical signal for carrying the radio frequency signal to be fed; wherein the phase of the symbols included in the encoded signal changes with time, and the phase difference between adjacent symbols is equal;

[0006] The radio frequency signal, the encoded signal, and the optical signal to be fed are modulated to obtain a modulated signal whose phase change is the same as that of the encoded signal;

[0007] The modulated signal is split into several sequentially arranged split signals, which correspond to several sequentially arranged antennas.

[0008] The split signals are delayed to obtain delayed signals; the delay time of the split signals is determined according to their sequence numbers.

[0009] The time-delayed signal is fed into a circular antenna array to obtain a vortex wave; the number of modes of the vortex wave is determined according to the phase difference between adjacent symbols of the coded signal.

[0010] Change the encoded signal to switch the number of vortex wave modes.

[0011] Furthermore, the coded signal is modified to switch the number of modes of the vortex wave, including:

[0012] By changing the phase difference between adjacent symbols of the coded signal, the number of modes of the vortex wave can be switched.

[0013] Furthermore, each symbol has the same duration; the delay time for each branched signal is longer than the delay time of the previous branched signal by the duration of one symbol.

[0014] Furthermore, before splitting the modulated signal, the method also includes:

[0015] The modulated signal is then subjected to optical amplification and photoelectric conversion.

[0016] Furthermore, before switching the mode number of the vortex wave, the method also includes:

[0017] The same signal is fed into a circular antenna array to make the circular antenna array generate a plane wave.

[0018] Furthermore, the number of modes of the vortex wave is an integer, and the absolute value of the number of modes of the vortex wave is less than half the number of antennas included in the circular antenna array.

[0019] Furthermore, the phase difference between adjacent symbols of the encoded signal is less than π and greater than -π.

[0020] This application also provides a vortex wave mode switching device, including a circular antenna array comprising a plurality of antennas arranged in sequence, characterized in that the device further includes:

[0021] The signal acquisition module is used to acquire the radio frequency signal to be fed, the encoded signal for modulating the phase of the radio frequency signal to be fed, and the optical signal for carrying the radio frequency signal to be fed; wherein, the phase of the symbols included in the encoded signal changes with time, and the phase difference between adjacent symbols is equal;

[0022] The phase encoding module is used to modulate the radio frequency signal, the encoded signal, and the optical signal to be fed, so as to obtain a modulated signal whose phase change is the same as that of the encoded signal.

[0023] The signal splitting module is used to split the modulated signal to obtain a number of sequentially arranged split signals corresponding to a number of sequentially arranged antennas;

[0024] The signal delay module is used to delay the branched signals to obtain delayed signals; the delay time of the branched signals is determined according to their sequence numbers.

[0025] The signal feeding module is used to feed the time-delayed signal into the circular antenna array to obtain a vortex wave; wherein, the number of modes of the vortex wave is determined according to the phase difference between adjacent symbols of the coded signal.

[0026] The mode switching module is used to change the encoded signal to switch the number of modes of the vortex wave.

[0027] This application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the above-described method.

[0028] This application also provides a non-transitory computer-readable storage medium that stores computer instructions for causing a computer to perform the above-described method.

[0029] As can be seen from the above, the vortex wave mode switching method, apparatus, electronic device, and storage medium provided in this application are based on microwave photonic phase coding technology. They modulate the radio frequency signal to be fed, a coded signal whose phase changes continuously in a step-like manner over time, and an optical signal to obtain a modulated signal whose phase changes continuously in a step-like manner over time. Then, based on the optical beamforming network using the delay method in radar technology, the modulated signal is split and different time delays are introduced, so that the radio frequency signal to be fed meets the phase conditions for vortex wave generation, thus obtaining a vortex wave. Subsequently, the vortex wave mode is controlled and mode switching is performed by controlling the coded signal. This method has strong adjustability and high flexibility; the duration of the same mode and the switching speed of different modes can be flexibly adjusted by controlling the coded signal, enabling rapid switching of multiple modes and greatly helping to improve radar scanning rate and imaging resolution. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a flowchart illustrating the vortex wave mode switching method according to an embodiment of this application.

[0032] Figure 2 This is a schematic diagram of the modulation signal in Embodiment 1 of this application.

[0033] Figure 3 This is a schematic diagram of the phase change of the signal fed into the antenna according to Embodiment 1 of this application.

[0034] Figure 4 This is a schematic diagram of the vortex wavefront distribution in Mode 1 of Embodiment 1 of this application.

[0035] Figure 5 This is a schematic diagram of the modulation signal in Embodiment 2 of this application.

[0036] Figure 6 This is a schematic diagram of the vortex wave mode switching device according to an embodiment of this application.

[0037] Figure 7 This is a schematic diagram of the hardware structure of the server in an embodiment of this application. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0039] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0040] Orbital angular momentum (OAM) is a physical quantity in classical electrodynamics that describes the rotational property of electromagnetic waves around their propagation axis. Electromagnetic waves exhibiting this characteristic are called vortex waves. The spatial electromagnetic field distribution of vortex waves has a helical phase factor. Containing more phase information, it has a significant advantage in radar detection; in addition, vortex waves with different mode numbers L are mutually orthogonal during spatial transmission, thus providing a new multiplexing dimension in the field of communication.

[0041] Vortex waves can be generated by a uniform circular array (UCA), and the number of antennas N in the circular array determines the maximum number of OAM wave modes that can be generated. Since radar imaging resolution and scan rate are related to the number of modes and the mode switching rate, respectively, achieving rapid multi-mode switching of vortex waves is beneficial for improving scan rate and imaging resolution, and has broad application prospects in radar imaging and target recognition. In related technologies, using an electric phase shifter to process the phase of the signal to be fed is complex and makes it difficult to achieve multi-mode switching of vortex waves. Furthermore, although switching the signal group to be fed using an optical switch successfully achieves vortex wave mode switching, the switching speed is limited by the response speed of the optical switch. Other methods cannot meet the requirements for rapid multi-mode switching of vortex waves.

[0042] In view of the above-mentioned deficiencies in related technologies, embodiments of this application provide a vortex wave mode switching method, apparatus, electronic device and storage medium.

[0043] The vortex wave mode switching method, apparatus, electronic device, and storage medium provided in this application are based on microwave photonic phase coding technology. They modulate the radio frequency signal to be fed, a coded signal whose phase changes continuously in a step-like manner over time, and an optical signal to obtain a modulated signal whose phase changes continuously in a step-like manner over time. Then, based on the optical beamforming network using the delay method in radar technology, the modulated signal is split and different time delays are introduced, so that the radio frequency signal to be fed meets the phase conditions for vortex wave generation, thus obtaining a vortex wave. Subsequently, the vortex wave mode is controlled and switched by controlling the coded signal. This method is highly adjustable and flexible; the duration of the same mode and the switching speed of different modes can be flexibly adjusted by controlling the coded signal, enabling rapid switching between multiple modes and significantly improving radar scanning rate and imaging resolution.

[0044] Figure 1 The flowchart of the vortex wave mode switching method provided in the embodiments of this application is shown.

[0045] This application provides a vortex wave mode switching method for a circular antenna array, the circular antenna array comprising a plurality of antennas arranged in sequence, the method comprising:

[0046] A modulated signal is obtained by modulating the radio frequency signal, the encoded signal, and the optical signal.

[0047] In this embodiment, signal modulation is performed using microwave photonic phase coding technology to obtain a modulated signal that can be used to generate vortex waves.

[0048] Microwave photonic phase coding technology is a technique that differs from traditional methods that use the electrical domain to generate phase-coded signals. Devices using traditional electrical domain methods often struggle to meet the development requirements of radar devices due to issues such as frequency tuning range, electromagnetic interference, and transmission loss. In contrast, microwave photonic phase coding technology, which generates phase-coded signals in the optical domain, offers a wider frequency operating range, stronger anti-interference capabilities, lower transmission loss, and a higher pulse compression ratio, thus better meeting the needs of radar devices.

[0049] As an optional embodiment, signal modulation is performed based on the radio frequency signal, the coded signal, and the optical signal to obtain a modulated signal, including:

[0050] The system acquires a radio frequency (RF) signal to be fed, an encoded signal for modulating the phase of the RF signal to be fed, and an optical signal for carrying the RF signal to be fed. The encoded signal includes symbols whose phases change over time, and the phase difference between adjacent symbols is equal.

[0051] In this embodiment, the radio frequency signal to be fed is a signal to be fed into a circular antenna array for transmission via the antenna for radar imaging or target identification. The coded signal has a phase that changes over time and is modulated to change the phase of the radio frequency signal to be fed. The optical signal serves as the carrier signal; using optical signals as a carrier improves the signal bandwidth and resolution, reduces transmission loss, and enhances the signal's resistance to electromagnetic interference.

[0052] The radio frequency signal, the encoded signal, and the optical signal to be fed are modulated to obtain a modulated signal whose phase change is the same as that of the encoded signal.

[0053] In this embodiment, the radio frequency signal, the encoded signal, and the optical signal to be fed are modulated to change the phase of the radio frequency signal to be fed so that its phase change is the same as that of the encoded signal, thus obtaining the modulated signal.

[0054] The modulated signal is split into several sequentially arranged branched signals, which correspond to several sequentially arranged antennas.

[0055] In this embodiment, the modulation signal is split according to the number of antennas that make up the circular antenna array, resulting in a number of split signals equal to the number of antennas. This ensures that each antenna receives a feed signal, thereby forming a vortex wave.

[0056] The split signals are delayed to obtain delayed signals. The delay time for each split signal is determined by its sequence number.

[0057] In this embodiment, by delaying the branched signals, the phase values ​​of the signals fed into the antenna at the same time are at different steps, thereby causing the circular antenna array to emit vortex waves.

[0058] As an optional embodiment, each symbol has the same duration. The delay time for each split signal is longer than the delay time of the previous split signal by the duration of one symbol.

[0059] In this embodiment, the split signals are delayed according to the duration of the symbol, so that the signal of each antenna differs from the signal of the previous antenna by the duration of one symbol, so that the signals fed into two adjacent antennas at the same time are exactly two adjacent phases.

[0060] In Example 1, the encoded signal is quaternary, and the circular antenna array has four antennas. Figure 2 The modulation signal of Embodiment 1 is shown. (Reference) Figure 2 The modulated signal includes four phases, labeled 1, 2, 3, and 4, with adjacent phase differences being... Figure 3The phase change of the signal fed into the antenna in Embodiment 1 is shown. (Reference) Figure 3 The signal is split into four paths and then introduced with time delays of 0, τ, 2τ, and 3τ respectively (τ is the duration of a single symbol in the coded signal), and then fed into four antennas numbered A, B, C, and D. When the phase changes in the order of 1, 2, 3, 4, a vortex wave of mode 1 is generated. Figure 4 A schematic diagram of the vortex wavefront distribution of Mode 1 in Embodiment 1 is shown.

[0061] In this way, by delaying the signal of two adjacent antennas, the signals of two adjacent antennas are in two adjacent phases, thus enabling the circular antenna array to generate vortex waves.

[0062] The time-delayed signal is fed into a circular antenna array to obtain a vortex wave. The number of modes of the vortex wave is determined based on the phase difference between adjacent symbols of the coded signal.

[0063] Since the number of modes of a vortex wave is determined by the phase difference between the signals fed into adjacent antennas, i.e. the slope of the step, and the slope of the step is controlled by the coded signal, the number of modes of a vortex wave is determined according to the phase difference between adjacent symbols of the coded signal.

[0064] Change the encoded signal to switch the number of vortex wave modes.

[0065] In this embodiment, since the number of modes of the vortex wave is determined according to the encoding signal, the number of modes of the vortex wave can be switched by changing the encoding signal.

[0066] As an optional embodiment, changing the coded signal to switch the number of modes of the vortex wave includes:

[0067] By changing the phase difference between adjacent symbols of the coded signal, the number of modes of the vortex wave can be switched.

[0068] In this embodiment, since the number of vortex wave modes is determined based on the phase difference between adjacent symbols of the encoded signal, the number of vortex wave modes can be switched by changing the phase difference between adjacent symbols of the encoded signal.

[0069] As an optional embodiment, the number of modes of the vortex wave is an integer, and the absolute value of the number of modes of the vortex wave is less than half the number of antennas included in the circular antenna array.

[0070] The range of modes of a vortex wave is related to the number of antennas in the circular antenna array. A stable vortex wave can only be generated by a circular antenna array when the absolute value of the mode number is less than half the number of antennas in the array. This can be expressed by the formula: (N is the phase encoding base or the number of circular array antennas, and L is the number of vortex wave modes).

[0071] As an optional embodiment, the phase difference between adjacent symbols of the encoded signal is less than π and greater than -π.

[0072] The minimum phase difference between adjacent symbols in the coded signal can be the ratio of 2π to the number of antennas in the circular antenna array. Based on the relationship between the number of modes and the number of antennas in the circular antenna array, the range of the phase difference can be obtained as -π to π.

[0073] In Example 1, reference Figure 2 and Figure 3 When the phase changes in the order of 4, 3, 2, 1, a vortex wave of mode-1 is generated. That is, the dual-mode fast switching of the vortex wave is realized by using microwave photonic phase coding technology.

[0074] In Example 2, the encoded signal is octal, and the circular antenna array has eight antennas. Figure 5 The modulation signal of Embodiment 2 is shown. (Reference) Figure 5 The modulated signal includes eight phases, labeled 1, 2, 3, 4, 5, 6, 7, and 8, with adjacent phase differences being [missing information]. The signal is split into eight paths and then introduced with a time delay of (n-1)τ (n = 1, 2, 3, 4, 5, 6, 7, 8, where τ is the duration of a single symbol in the coded signal) before being fed into eight antennas. When the phase changes in the order of 1, 2, 3, 4, 5, 6, 7, 8, a vortex wave of mode 1 is generated; when the phase changes in the order of 1, 3, 5, 7, 1, 3, 5, 7, a vortex wave of mode 2 is generated. Similarly, vortex waves of modes ±1 and ±2 can be generated, thus achieving fast switching between multiple modes.

[0075] And so on, when the conditions are met... Under the premise of [unclear], rapid switching of vortex wave multi-mode based on microwave photonic phase coding technology and circular antenna array can be realized.

[0076] In this way, the vortex wave mode can be controlled and the mode switching can be performed by controlling the coded signal through phase coding technology. This makes the method of the embodiments of this application highly adjustable and flexible. The duration of the same mode and the switching speed of different modes can be flexibly adjusted through the coded signal, and multiple modes can be switched quickly, which greatly helps to improve the radar scanning rate and imaging resolution.

[0077] Considering that the modulated signal may be lost during transmission, and that the signal fed into the antenna needs to be an electrical signal.

[0078] As an optional embodiment, the method further includes, before splitting the modulated signal:

[0079] The modulated signal is then subjected to optical amplification and photoelectric conversion.

[0080] In this embodiment, the modulation signal can be optically amplified using an optical amplifier, such as an erbium-doped fiber amplifier, to increase its power and reduce signal loss during transmission. After optical amplification, the modulation signal can be converted into an electrical signal by a photoelectric converter before reaching the splitter, allowing for further signal splitting.

[0081] In this way, by optically amplifying the modulated signal, the loss of the modulated signal during transmission is reduced, and by photoelectric conversion of the modulated signal, the modulated signal is converted into an electrical signal that can be fed into the antenna.

[0082] Considering that the mode switching process may cause disturbances, measures need to be taken to avoid disturbances during mode switching.

[0083] As an optional embodiment, the method further includes, before switching the mode number of the vortex wave:

[0084] The same signal is fed into a circular antenna array to make the circular antenna array generate a plane wave.

[0085] refer to Figure 3 Because a circular antenna array will generate a plane wave when all the antennas of the circular antenna array have the same signal, in this embodiment, the same signal (i.e., the "0" signal in the figure) is fed into each antenna of the circular antenna array between mode 1 and mode 2 so that the circular antenna array generates a plane wave.

[0086] In this way, by generating a plane wave in the circular antenna array before switching the mode number of the vortex wave, disturbances during the mode switching process are avoided, ensuring the stability of the vortex wave.

[0087] like Figure 6 As shown, this application also provides a vortex wave mode switching device, including a circular antenna array, the circular antenna array including a plurality of antennas arranged in sequence, and the device further includes:

[0088] The signal acquisition module is used to acquire a radio frequency signal to be fed, an encoded signal for modulating the phase of the radio frequency signal to be fed, and an optical signal for carrying the radio frequency signal to be fed; wherein, the phase of the symbols included in the encoded signal changes with time, and the phase difference between adjacent symbols is equal;

[0089] A phase encoding module is used to modulate the radio frequency signal to be fed, the encoded signal, and the optical signal to obtain a modulated signal whose phase change is the same as that of the encoded signal.

[0090] A signal splitting module is used to split the modulated signal to obtain a plurality of sequentially arranged split signals corresponding to the plurality of sequentially arranged antennas;

[0091] A signal delay module is used to delay the branched signals to obtain delayed signals; wherein the delay time of the branched signals is determined according to their sequence number.

[0092] A signal feeding module is used to feed the time-delayed signal into the circular antenna array to obtain a vortex wave; wherein, the number of modes of the vortex wave is determined according to the phase difference between adjacent symbols of the coded signal;

[0093] The mode switching module is used to change the encoded signal to switch the mode number of the vortex wave.

[0094] As an optional embodiment, a signal processing module is also included for optical amplification and photoelectric conversion of the modulated signal.

[0095] As an optional embodiment, a plane wave generation module is also included for feeding the same signal into the circular antenna array so that the circular antenna array generates a plane wave.

[0096] Based on the same inventive concept, corresponding to the methods of any of the above embodiments, this disclosure also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the vortex wave mode switching method described in any of the above embodiments.

[0097] Figure 7 This embodiment illustrates a more specific server hardware structure, which may include a processor 1010, a memory 1020, an input / output interface 1030, a communication interface 1040, and a bus 1050. The processor 1010, memory 1020, input / output interface 1030, and communication interface 1040 are interconnected internally via the bus 1050.

[0098] The processor 1010 can be implemented using a general-purpose CPU (Central Processing Unit), microprocessor, application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of this specification.

[0099] The memory 1020 can be implemented in the form of ROM (Read Only Memory), RAM (Random Access Memory), static storage device, dynamic storage device, etc. The memory 1020 can store operating devices and other application programs. When the technical solutions provided in the embodiments of this specification are implemented by software or firmware, the relevant program code is stored in the memory 1020 and is called and executed by the processor 1010.

[0100] The input / output interface 1030 is used to connect input / output modules to realize information input and output. Input / output modules can be configured as components in the server (not shown in the figure) or externally connected to the server to provide corresponding functions. Input devices may include keyboards, mice, touchscreens, microphones, various sensors, etc., while output devices may include displays, speakers, vibrators, indicator lights, etc.

[0101] The communication interface 1040 is used to connect the communication module (not shown in the figure) to enable communication between this server and other devices. The communication module can communicate via wired means (such as USB, Ethernet cable, etc.) or wireless means (such as mobile network, WIFI, Bluetooth, etc.).

[0102] Bus 1050 includes a pathway for transmitting information between various components of the server, such as processor 1010, memory 1020, input / output interface 1030, and communication interface 1040.

[0103] It should be noted that although the above-described electronic device only shows the processor 1010, memory 1020, input / output interface 1030, communication interface 1040, and bus 1050, in specific implementations, the electronic device may also include other components necessary for normal operation. Furthermore, those skilled in the art will understand that the above-described electronic device may only include the components necessary for implementing the embodiments of this specification, and not necessarily all the components shown in the figures.

[0104] The electronic devices described above are used to implement the corresponding vortex wave mode switching methods in any of the foregoing embodiments, and have the beneficial effects of the corresponding method embodiments, which will not be repeated here.

[0105] Based on the same inventive concept, corresponding to the methods of any of the above embodiments, this disclosure also provides a non-transitory computer-readable storage medium storing computer instructions for causing the computer to execute the vortex wave mode switching method as described in any of the above embodiments.

[0106] The computer-readable medium of this embodiment includes permanent and non-permanent, removable and non-removable media, and information storage can be implemented by any method or technology. Information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transfer medium that can be used to store information accessible by a computing device.

[0107] The computer instructions stored in the storage medium of the above embodiments are used to cause the computer to execute the vortex wave mode switching method as described in any of the above embodiments, and have the beneficial effects of the corresponding method embodiments, which will not be repeated here.

[0108] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in the details for the sake of brevity.

[0109] Although this application has been described in conjunction with specific embodiments thereof, many substitutions, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description.

[0110] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A vortex wave mode switching method for a circular antenna array, the circular antenna array comprising a plurality of antennas arranged in sequence, characterized in that, The method includes: The method acquires a radio frequency signal to be fed, an encoded signal for modulating the phase of the radio frequency signal to be fed, and an optical signal for carrying the radio frequency signal to be fed; wherein the phase of the symbols included in the encoded signal changes with time, and the phase difference between adjacent symbols is equal; The radio frequency signal to be fed, the encoded signal, and the optical signal are modulated to obtain a modulated signal whose phase change is the same as that of the encoded signal; The modulation signal is split into several sequentially arranged split signals corresponding to the several sequentially arranged antennas; The split signals are delayed to obtain delayed signals; wherein the delay time of the split signals is determined according to their sequence numbers. The time-delayed signal is fed into the circular antenna array to obtain a vortex wave; wherein, the number of modes of the vortex wave is determined according to the phase difference between adjacent symbols of the coded signal; The encoded signal is changed to switch the number of modes of the vortex wave.

2. The vortex wave mode switching method according to claim 1, characterized in that, The step of changing the encoded signal to switch the mode number of the vortex wave includes: The phase difference between adjacent symbols of the encoded signal is changed to switch the mode number of the vortex wave.

3. The vortex wave mode switching method according to claim 1, characterized in that, Each of the symbols has the same duration; the delay time of each of the split signals is longer than the delay time of the previous split signal by the duration of one symbol.

4. The vortex wave mode switching method according to claim 1, characterized in that, Before splitting the modulated signal, the method further includes: The modulated signal is then subjected to optical amplification and photoelectric conversion.

5. The vortex wave mode switching method according to claim 1, characterized in that, Before switching the mode number of the vortex wave, the method further includes: The same signal is fed into the circular antenna array to generate a plane wave.

6. The vortex wave mode switching method according to claim 1, characterized in that, The number of modes of the vortex wave is an integer, and the absolute value of the number of modes of the vortex wave is less than half the number of antennas included in the circular antenna array.

7. The vortex wave mode switching method according to claim 1, characterized in that, The phase difference between adjacent symbols of the encoded signal is less than π and greater than -π.

8. A vortex wave mode switching device, comprising a circular antenna array, the circular antenna array comprising a plurality of antennas arranged in sequence, characterized in that, The device further includes: The signal acquisition module is used to acquire a radio frequency signal to be fed, an encoded signal for modulating the phase of the radio frequency signal to be fed, and an optical signal for carrying the radio frequency signal to be fed; wherein, the phase of the symbols included in the encoded signal changes with time, and the phase difference between adjacent symbols is equal; A phase encoding module is used to modulate the radio frequency signal to be fed, the encoded signal, and the optical signal to obtain a modulated signal whose phase change is the same as that of the encoded signal. A signal splitting module is used to split the modulated signal to obtain a plurality of sequentially arranged split signals corresponding to the plurality of sequentially arranged antennas; A signal delay module is used to delay the branched signals to obtain delayed signals; wherein the delay time of the branched signals is determined according to their sequence number. A signal feeding module is used to feed the time-delayed signal into the circular antenna array to obtain a vortex wave; wherein, the number of modes of the vortex wave is determined according to the phase difference between adjacent symbols of the coded signal; The mode switching module is used to change the encoded signal to switch the mode number of the vortex wave.

9. An electronic device, characterized in that, It includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the program, implements the method as described in any one of claims 1 to 7.

10. A non-transitory computer-readable storage medium, characterized in that, The non-transitory computer-readable storage medium stores computer instructions for causing the computer to perform the method as described in any one of claims 1 to 7.

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